Drop-hammer.



L. G. BAYRER.

DROP HAMMER.

APPLICATION FILED MAR. 2, 1915.

Patented May 8, 1917.

WITNESSES:

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LOUIS G. BAYIRER, OF HARTFORD, CONNECTICUT, ASSIGNOR TO THE BILLINGS & SPEN- GER COMPANY, OF HARTFORD, CONNECTICUT, A CORPORATION OF CONNECTICUT.

DROP-HAMMER.

Specification of Letters Patent.

Patented May 8, 15917.

Application filed March 2, 1915. Serial No. 11,448.

To all whom it may concern Be it known that I, LOUIS G. BAYRER, a citizen of the United States, and a resident of Hartford, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Drop- Hammers, of which the following is a speci fication.

This invention relates particularly to improvements in board clamps for drop hammers, which are customarily located at the top of the machine and utilized to grip the board to which the hammer is secured to hold the hammer in raised position. As is well known, a board clamp comprises a pair of oppositely arranged members, one of which, the inactive member, is adjustable to take up for wear of the board, and the other, the active member, is operable by a foot treadle or similar mechanism to release the board and permit the hammer to drop. The object of the present invention is to provide an improved adjustment for the inactive member, and an improved operating connection for the active member.

In the drawings Figure 1 is a side elevation of the head of a machine equipped with my invention.

Fig. 2 is a plan view thereof.

Referring to the drawings, a denotes the top of the machine, 6, the head secured thereto, and in which the board clamp is mounted. 0 denotes the inactive clamp member, and (Z the active clamp member. The inactive member 0 is supported on a pin 5 which has flattened ends adapted to slide in the slots 6, in the sides of the head to permit of adjusting the inactive members toward or away from the center line of the machine. The enlargement 7 at the end of the slot permits of the assembly of the parts. The pin is fiatted off at one side centrally of its length, as indicated at 8, and bearing against this fiatted portion is a plug 9 sliding in a hole in the end wall of the head, the end of the plug projecting into a socket 10 the rear wall of which is inclined as indicated at 11. In this socket a wedge 12 is located operable by a bar 13, so that it may be raised or lowered to slide the inactive member and to hold it in position. The bar 13 extends downwardly and its end passes through a lug 30 secured to one of the side uprights of the machine at a point where the bar can be reached by the operator standing on the floor. The bar is held in position by the adjusting nuts 31, 32, above and below the lug. This wedge attachment is an extremely strong and efficient one, is not liable to become worn or displaced by the jars and shocks incident to the ordinary use of the machine, and very securely holds the inactive member up in position. The active member (Z is mounted on a pin 20 which is supported at its ends in the sides of the head. On another pin 21, which is similarly supported, is mounted a lever 22, to the projecting end of which an operating bar 23 is secured, connected at its lower end to a foot treadle or similar device. This lever 22 has a bifurcated forward end 25, supporting a pin 26. A link 27 connects the pins 20, 26, producing a toggle connection between the head 6 and the lever 22. While the clamp is actively engaging the board, the tendency of the weight of the hammer is to pull the head 6 down, with the result that it tends to straighten out the toggle connection and thus cause the clamp to even more securely grip the board. At the same time no great pressure on the foot treadle is required to break the toggle and to retract the active member to release the board and hammer. Thus the treadling of the machine is made very much easier without diminishing the effective grip of the board.

I claim as my invention:

1. In a machine of the character described, a board clamp comprising an active clamp member operable to release a board, and an inactive clamp member, slide ways in which said inactive member is free to move toward and away from the active member to adjust and retain the spacing of said board clamps, a support, a wedge depending there from at the rear of and adapted to act upon said inactive member, and means for adjusting and holding said support.

2. In a machine of the character described, a base, side uprights, a head, a board clamp mounted on said head and comprising active and inactive clamp members, said inactive clamp member being slidingly supported, a socket into which the rear end of the inactive member projects, a wedge fitting in said socket and bearing against the rear end of said inactive member to cause its movement toward said active member, a downwardly extending bar connected with said clamp, a lug near the bottom of one of said side uprights through Which said bar passes, and adjusting nuts threaded onto said bar above and below said lug.

3. In a machine of the character described, the combination With the slidingly mounted active member of a board clamp, of operating means therefor, comprising a lever pivotally supported in said head, a connection between the outer end of said lever and a foot treadle, and a link connecting the inner end of said lever with said clamp mems ber.

Copies of this patent may be obtained for 4. In a machine of the character de scribed, including a head and a board clamp located therein, a pin upon which the active member of said board clamp is mounted, a sliding support for said pin in the sides of the head, a lever pivotally mounted in said head, and a link connection between the inner end of said lever and said clamp memher.

7 LOUIS G. BAYRER. Witnesses:

J. O. VAN ZANnT, W. M. HARNEY.

five cents each, by addressing the Commissioner of latents,

Washington, D. G, 

